The gamma-ray detectors were from the TESSA3 array  and the beams were provided by the facility at Louvain-la-Neuve . The beam was pulsed, with a repetition rate of 73ns. Evaporated charged particles were detected in the LEDA silicon array , protected from scattered beam using foils. In this experiment, known as `TaLL' (TESSA at Louvain-la-Neuve with LEDA), the gamma array was small (seven 25% detectors) and the unbacked target was relatively thick (1.6 mg/cm2). The forward hemisphere had no gamma detectors, and was open to allow the escape of scattered beam to the foils in front of LEDA, at a distance of 140mm. Only one pair of gamma detectors (two of the three at 90) faced each other through the target.
All events in which at least one escape suppressed gamma-ray was detected were written to tape. Any charged particles or other gamma-rays in slow coincidence (4s) were also recorded. In addition, the gamma timing relative to the beam pulses was recorded, so that fast coincidences (ns) could be analysed off-line.